Duration: The length of the video. The tag value is an ISO 8601 duration in the format PT#M#S, in which the letters PT indicate that the value specifies a period of time, and the letters M and S refer to length in minutes and seconds, respectively. The # characters preceding the M and S letters are both integers that specify the number of minutes (or seconds) of the video. For example, a value of PT15M51S indicates that the video is 15 minutes and 51 seconds long.
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